JP4884170B2 - Bending point deviation correction device in roll forming apparatus - Google Patents

Description

  The present invention relates to a bending point deviation correcting device that corrects a deviation of a bending point in a roll forming apparatus when a position of entry of a forming material into a forming roll of a next forming stand shifts.

The roll forming apparatus is a device for bending a band-shaped metal plate between upper and lower rolls of a multi-stage forming stand to obtain a formed product having a predetermined cross-sectional shape. The molding material may shift in the width direction due to factors. If the molding material is displaced in the width direction, the resulting product is usually a bent product (however, it cannot be said unconditionally depending on various conditions), so measures are taken to prevent the molding material from shifting in the width direction ( Patent Document 1).
As a means for preventing the deviation in the width direction of the molding material, at the stage of a flat plate in which the material is not bent, a pinch roll 103 comprising a pair of upper and lower rolls 101 and 102 as shown in FIG. Thus, a method of preventing the material (plate material) 104 from shifting in the width direction or a method of providing guide rollers for regulating and guiding both edges of the plate material on both sides of the plate material is employed.
Further, as a means for correcting the deviation of the molding material that has been subjected to a certain bending process, as shown in FIG. Is also placed between the molding stands.
Further, as shown in FIG. 21 (c), a means for installing a deviation correcting device 109 comprising a pair of left and right idle vertical rolls 107 and 108 for restraining a material (molding material) 104 ″ from both left and right sides is general. It is.
FIG. 7 of JP2003-251413A

  By the way, in roll forming, it is required that a molding material molded by a molding roll of a certain molding stand can smoothly enter a molding roll (referred to as the next roll) of the next molding stand. It is important that the bending point can smoothly enter the corresponding bending point location of the next roll (corresponding bending point location of the next roll hole mold). In FIGS. 21 (b) and 21 (c), from the viewpoint of obtaining an unbent product, it is a means for preventing the overall deviation of the molding material in the width direction. This is a particular problem. In other words, if the bending point of the molding material in the middle of molding is deviated from the corresponding bending point of the next roll, the molding material cannot enter the next roll, or even if it can enter, the molding material cannot be deformed. May occur.

The molding material 20 shown in FIG. 17 has two bending points b and c near the end in the material width direction, two bending points a and d on the center side, the bending point b and the bending point d, In the case of forming the molding material 20 having a cross-sectional shape with a curved bend part e between which has a significant asymmetry with respect to the bending point, and having such a cross-sectional shape with a remarkable bending point asymmetry, FIG. Compared with the case where the molding material 104 ″ having a symmetrical cross section as shown in FIG. 5 is molded, the deviation of the bending points b and c near the end in the material width direction is particularly likely to occur.
The cause of the deviation of the bending point is mainly caused by the spring back of the material and mainly caused by the bending of the material. As shown in FIG. 17, the cross-sectional shape having the curved bent portion e has a cross-sectional shape as indicated by a broken line 20 ′ for spring back, and the position of the bending point in the vicinity of the material width direction end portion is on the material width direction end portion side. Shift. A shift amount of, for example, the bending point c due to spring back indicated by y _1. In this case, the relationship between the molding material with the bending point c shifted and the hole shape of the next roll is as shown in FIG. 18, and the shifted bending point c is difficult to enter the corresponding bending point k of the next roll. In the figure, the gap between the upper roll 6 and the lower roll 7 forms a roll hole mold.
Further, in the molding of the cross-sectional shape having a remarkable asymmetry with respect to the bending point as shown in FIG. 17, the bending is usually generated on the side where the bending point is large (the left side in FIG. 17), so that the entire molding material is indicated by the broken line 20 ″. since shifts in, showing the amount of deviation caused by for example bending point c the curvature of the bending point of the material width direction end portion also shifts to the material width direction end portion side. profiled by y _2. in this case, the bending point c The relationship between the shifted molding material and the hole shape of the next roll is as shown in FIG. 19, and the shifted bending point c is difficult to enter the corresponding bending point k of the next roll.
In this case, since the displacement amount y ₁ due to the spring back and the displacement amount y ₂ due to the bending are superimposed, the displacement amount of the bending point c with respect to the corresponding bending point location k of the next roll is indicated by a broken line 20 in FIG. As indicated by ''', y ₁ + y ₂ is obtained, and the amount of deviation becomes large, and it becomes difficult to enter the next roll.

As means for correcting the deviation of the bending point as described above, the deviation correcting device 109 using the vertical rolls 107 and 108 in FIG. 21 (C) has a relatively simple and symmetrical cross section like the molding material 104 ″ in FIG. In the case of a shape, it is appropriate, but in the case of a cross-sectional shape having a complicated, asymmetrical and curved bending portion such as the molding material 20 of FIG.
First, it is not always easy to manufacture a profile vertical roll having a complicated cross-sectional shape such as the molding material 20, and the cost increases. Moreover, since such a vertical roll becomes a large-sized thing and two vertical rolls on either side are required, roll cost also becomes high also at that point. Moreover, although the mechanism which adjusts the width direction position and height position of a vertical roll is required, since the roll size is large and two right and left are required, the whole including a position adjustment mechanism becomes large.

  The present invention has been made to solve the above-described conventional drawbacks, and an object of the present invention is to provide a compact and inexpensive bending point deviation correcting device that can effectively correct the bending point deviation of a molded material. .

The present invention that solves the above-mentioned problems is the vicinity of the end in the material width direction by a roll forming apparatus that obtains a molded product having a predetermined cross-sectional shape by bending a band-shaped metal plate between upper and lower rolls of a multi-stage forming stand. When forming a molding material having a cross-sectional shape having a first bending point and a second bending point on the center side of the first bending point, the molding stand next to the first bending point in the vicinity of the material width direction end is formed. When the entry position to the roll deviates from the corresponding bending point location of the forming roll of the next forming stand, the bending point deviation correcting device in the roll forming apparatus corrects the deviation of the bending point,
In the middle of the front and rear forming stands, an idle deviation correcting roll that can rotate while contacting the lower surface of the material is provided so that the position in the material width direction and the height position can be adjusted. It is provided in the aspect which pushes up the position close | similar to the 2nd bending point between the bending point of this, and the 2nd bending point.

  According to a second aspect of the present invention, in the bending point deviation correcting device according to the first aspect, the axis of the deviation correcting roll is in a vertical plane perpendicular to the material traveling direction and the vertical inclination of the axis is adjustable. It is characterized by.

  According to a third aspect of the present invention, in the bending point deviation correcting device according to the first aspect, the axis of the deviation correcting roll is in a vertical plane having an angle with respect to a direction perpendicular to the material traveling direction, and the angle of the axis is adjusted. It is provided as possible.

  According to a fourth aspect of the present invention, in the bending point deviation correcting device according to the third aspect, the vertical inclination of the axis of the deviation correcting roll is provided so as to be adjusted simultaneously.

  According to a fifth aspect of the present invention, in the bending point deviation correcting device according to any one of the first to fourth aspects, when the molding material having a cross-sectional shape having a curved bend between the first bending point and the second bending point is formed, the deviation is provided. The correction roll is provided in such a manner as to push up the position near the second bending point on the concave surface of the curved bending portion.

  A sixth aspect of the present invention provides the bending point deviation correcting device according to any one of the first to fifth aspects, wherein a plurality of downstream forming stands are collectively installed on the sole plate, and the sole plate is used as a fulcrum on the upstream side in the material traveling direction. It is installed between the forming stands on the sole plate in a roll forming apparatus provided on the downstream side so as to be rotatable in the roll width direction right and left.

In the present invention, the deviation of the bending point of the molding material can be corrected by pushing up the position near the second bending point between the first bending point and the second bending point of the molding material with the deviation correcting roll. it can. Thereby, the bending point of a molding material can be smoothly entered into the corresponding bending point location of the molding roll (next roll) of the next molding stand. Since the molding material can easily enter the next roll, the number of steps of the molding stand can be reduced.
In addition, the misalignment correcting roll in the present invention may be a simple disk-like one having a narrow roll width and a rounded outer peripheral surface, and since only one piece is required, it is complicated according to the cross-sectional shape of the molding material. Compared to the conventional vertical roll method that requires a profile and a pair of left and right, the roll is compact, the roll cost is low, and the bending point misalignment correction device is compact and inexpensive as a whole. .

  The bending point deviation correcting device according to claim 2 is suitable for application mainly to correcting a bending point deviation caused by springback of the molding material.

  The bending point deviation correcting apparatus according to claim 3 is suitable for application mainly to correcting a bending point deviation caused by bending of the molding material.

  The bending point deviation correcting device according to claim 4 is preferably applied to the case where the bending point deviation caused by the springback of the molding material and the bending point deviation caused by the bending of the molding material are corrected simultaneously.

In particular, in the case of a cross-sectional shape having a curved bend as in claim 5, bending point misalignment due to a springback is likely to occur greatly. Is appropriate.
In addition, when a metal plate made of a material having a large spring back is used, the bending point deviation tends to increase, so that it is particularly suitable as a bending point deviation correcting means for a material having a large spring back.

  Hereinafter, an embodiment of a bending point deviation correcting apparatus in the roll forming apparatus of the present invention will be described with reference to FIGS.

  In this embodiment, the case where the molding material (molded product) 20 having the cross-sectional shape shown in FIG. 17 is molded will be described. As described above, the molding material 20 has two bending points b and c near the end in the material width direction, two bending points a and d on the center side, and the bending point c and the bending point d. The cross-sectional shape is a curved bend (indicated by e as the bend), and the cross-sectional shape is extremely asymmetric with respect to the bending point. The curved bending part e can also be said to be a broad bending point. In this embodiment, in some cases, among the bending points on both sides of the curved bending portion e, the bending point c on the material width direction end side is the first bending point, and the bending point d on the center side is the second bending point. Call.

  1A and 1B show a part of a roll forming apparatus 42 provided with a bending point deviation correcting apparatus 41 according to an embodiment of the present invention. FIG. 1A is a plan view and FIG. 1B is a side view. In the figure, 3 is a molding machine bed, 4 is a molding stand installed on the molding machine bed 3 at intervals in the material traveling direction, 19 is a reduction gear connected to a drive motor (not shown), and 16 is a reduction gear. This is a universal joint that transmits the rotation of 19 output shafts to the roll shaft of the molding stand 4. In FIG. 1 and the subsequent figures, the material traveling direction is indicated by x, the horizontal direction from DS (driving side) to WS (working side) is indicated by y, and the height direction is indicated by z.

The bending point deviation correcting device 41 of the present invention is disposed between the molding stands 4. The detailed structure of the bending point deviation correcting device 41 will be described with reference to FIGS. 2 is a side view showing a part of the bending point deviation correcting device 41 in cross section, FIG. 3 is a front view showing a part in cross section, and FIG. 4 is a schematic plan view thereof. In these drawings, reference numeral 51 denotes a base fixed on the molding machine bed 3, and guide posts 52 are fixed vertically at four positions on the base 51, front, rear, left and right, and slidably fitted to the guide posts 52. A first frame 54 having a guide cylinder 53 to be fixed to the lower surface is provided. A screw 56 is vertically and rotatably provided at the central portion of the base 51, and a female screw portion 57 into which the screw 56 is screwed is fixed to the lower surface of the first frame 54. A worm wheel 58 is fixed to the screw 56, and a worm 59 fixed to a worm shaft 62 rotatably supported by a bearing 61 on the base 51 is engaged with the worm wheel 58.
When the worm shaft 62 is rotated, the worm wheel 58 meshing with the worm 59 integral therewith is rotated, the screw 56 is rotated integrally therewith, and the female screw portion 57 into which the screw 56 is screwed and the first screw integral therewith. The frame body 54 moves up and down. These mechanism parts that raise and lower the first frame body 54 constitute a height position adjusting mechanism 63 that adjusts the height position (position in the z direction in FIGS. 2 and 3) of a later-described displacement correcting roll 77.

A second frame 66 is provided in the first frame 54 so as to be slidable in the material width direction (the direction perpendicular to the paper surface in FIG. 2; the left-right direction (y direction) in FIG. 3). Guide ridges 67 extending in the material width direction are formed on the front and rear surfaces of the second frame 66 in the material traveling direction, and the guide ridges 67 are provided on the inner surfaces of the first frame 54 in the front and rear of the material traveling direction. As described above, the second frame 66 can slide in the material width direction with respect to the first frame 54.
In addition, a screw 68 extending in the material width direction is rotatably attached to the inside of the first frame body 54. A bearing 69 that rotatably supports the screw 68 is attached to the left and right side surfaces of the first frame body 54.
The screw 68 is screwed into a female screw portion 70 fixed to the lower surface of the second frame body 66. By rotating the screw 68, the female screw portion 70 and the second frame body 66 integral with the female screw portion 70 are moved in the material width direction. Can be moved to.
Portions such as the guide protrusion 67, the guide groove 54a, the screw 68, and the female thread portion 70 constitute a width direction position adjusting mechanism 72 that moves and adjusts a later-described deviation correcting roll 77 in the material width direction.

Inside the second frame 66, a third frame 75 is rotatably provided in a vertical plane orthogonal to the material traveling direction via a shaft 76 extending in the material traveling direction.
Inside the third frame 75, a displacement correcting roll 77 that pushes up the lower surface of the molding material and adjusts the deviation of the bending point of the molding material is rotatably provided via a shaft 78 with its upper portion exposed. It has been.
A worm wheel 79 is fixed to a shaft 76 that supports the third frame 75 via a key 83, and a worm shaft 81 that fixes a worm 80 that meshes with the worm wheel 79 is fixed to the second frame 66. 82 is rotatably supported.
As shown in FIGS. 5A and 5B, when the worm shaft 81 is rotated, the worm 80 integrated with the worm shaft 81 is rotated, and the worm wheel 79 and the shaft 76 integrated therewith are rotated. The third frame 75 integrated with the shaft 76 and the shift correcting roll 77 attached thereto rotate as indicated by arrows in FIG. 3, whereby the tilt angle of the shift correcting roll 77 can be adjusted. The third frame body 75, the shaft 76, the worm wheel 79, the worm 80, the worm shaft 81, etc. constitute an inclination angle adjusting mechanism 84 that adjusts the inclination angle of the deviation correcting roll 77.

A situation in which the bending point deviation of the molding material is corrected by the bending point deviation correcting device 41 will be described with reference to FIG. As shown in FIG. 6, the height correction mechanism 63, the width direction position adjustment mechanism 72, and the tilt angle adjustment mechanism 84 of the bending point deviation correction device 41 are operated in advance so that the deviation correction roll 77 is moved relative to the molding material 20. Deploy.
That is, the worm shaft 81 of the tilt angle adjusting mechanism 84 is rotated to rotate the shift correcting roll 77 around the shaft 78 together with the third frame 75, and the tilt angle of the shift correcting roll 77 is set to the tilt angle α as shown in FIG. To do. When the inclination α of the deviation correcting roll 77 is set to an angle that is substantially orthogonal to the surface of the molding material to be pushed up, the pushing-up force acts effectively. There are variations in the material (material, plate thickness, etc.), and the degree of springback of the molding material changes depending on the variation in the material, but the inclination angle α can be finely adjusted by the inclination angle adjusting mechanism 84 to cope with it. .
Next, the screw 68 of the width direction position adjusting mechanism 72 is turned to move the misalignment correcting roll 77 together with the second frame body 66 in the material width direction, and the material width direction position of the top is the bending point c (first bending point). And a bend point d (second bend point) near the bend point d (position indicated by G).
Next, the worm shaft 62 of the height position adjusting mechanism 63 is rotated to raise the height position of the top of the misalignment correction roll 77 together with the first frame body 54 to a height that pushes up the molding material 20 as shown in the figure.

When the misalignment correcting roll 77 is set to the position and orientation as described above and formed, the bending point c that deviates outward in the material width direction due to the increased radius of curvature for spring back after passing through the nth forming stand. The position of '(corresponding to the bending point c' in FIG. 17) is closer to the inner side in the material width direction and comes to the position of the bending point c ₁ 'on the (n + 1) th molding stand. That is, when pushed up the position of the bending point d closer in deviation corrected roll 77, since the molding material is the position G of the center side is pushed up in a state of being restrained in n stand position and n + 1 stand position, the broken lines 20 ₁ ' As shown, the radius of curvature of the curved bending portion e becomes smaller and the end side, which is a free end, is drawn toward the center side, and the position of the bending point c ′ approaches the center side (the position where the bending point approaches is c _1. '). By setting the position of c ₁ ′ to be approximately the corresponding bending point of the forming roll (next roll) of the next forming stand, the material can smoothly enter the next roll.

As described above, the deviation of the bending point of the molding material is corrected by the deviation correcting roll 77 and smoothly enters the corresponding bending point location of the next roll, so that the molding material can easily enter the next roll. The number of steps of the molding stand can be reduced as compared with the case where the deviation correcting roll 77 is not disposed.
Further, the deviation correcting roll 77 may be a simple disk having a narrow roll width and a rounded outer peripheral surface, and since only one piece is required, a complicated profile adapted to the cross-sectional shape of the molding material can be obtained. Compared with the conventional vertical roll system that needs to be arranged in a pair of left and right sides, the roll becomes compact, the roll cost is low, and the bending point deviation correcting device as a whole becomes compact and inexpensive.

  The cross-sectional shape of the molding material targeted by the bending point misalignment correction apparatus of the present invention is not limited to the above-described cross-sectional shape, and for example, as shown in FIG. And a cross-sectional shape having only the second bending point d on the center side thereof (a cross-sectional shape without the bending points b and a in the molding material), as shown in FIG. Sectional shape in which the height position of the first bending point c is higher than the second bending point d on the center side, as shown in FIG. 7 (d), the first bending point near the end in the material width direction The present invention can be applied to a molding material having a flat cross-sectional shape (cross-sectional shape without a curved bending portion) between c and the second bending point d on the center side, and other various cross-sectional shapes. In short, the present invention can be applied to molding materials having various cross-sectional shapes having a first bending point c in the vicinity of the end portion in the material width direction and a second bending point d on the center side thereof. The deviation correction amount in each is indicated by y. FIG. 7 (a) is the same as FIG. 6 but is shown for easy comparison with the other.

FIG. 8 (a) is a schematic plan view of a bending point deviation correcting device 41 ′ according to another embodiment of the present invention, and FIG. 9 shows a situation where the bending point deviation correcting device 41 ′ corrects the bending point deviation of the molding material. It is a figure explaining. The parts common to the bending point deviation correcting device 41 of FIGS. This bending point deviation correcting device 41 'is for correcting a deviation of the bending point of the molding material mainly due to the bending of the molding material. The bending point correcting roll 77' has a rotation direction with respect to the material traveling direction. It arrange | positions so that it may have the angle (beta), and the angle is provided so that adjustment is possible. That is, the axis 77a ′ of the deviation correcting roll 77 ′ is arranged in a vertical plane having an angle β with respect to a direction orthogonal to the material traveling direction, and the angle β of the axis 77a ′ is adjustable. Yes.
In this embodiment, as shown in FIG. 8B showing the inside of the second frame body 66, the third frame body 75 ′ that rotatably holds the displacement correcting roll 77 ′ is replaced with the second frame body 66. A horizontal worm shaft 93 fixed to a top end of a shaft 91 fixed to a worm wheel 90 and fixed to the upper end of a shaft 91 fixed to the worm wheel 90 is fixed to the second frame 66. It is attached to.
The height adjustment mechanism 63, the width direction movement adjustment mechanism 72, and the like are common to the bending point deviation correcting device 41 in FIGS.

In this embodiment, the deviation correcting roll 77 ′ rotates while pushing up the vicinity of the second bending point d of the molding material, and the rotation direction is inclined at an inclination angle β with respect to the material traveling direction, and At that time, a large frictional force is generated between the molding material 20 ″ and a force for moving the molding material 20 ″ in the material width direction is applied to the molding material 20 ″ with rotation, and the molding is performed as indicated by a broken line 20 ₁ ″. The entire material is moved in the material width direction, so that the bending point c ″ (corresponding to the bending point c ″ in FIG. 17) shifted outward in the material width direction is close to the center side and is positioned at c ₁ ″ in FIG. Come on. Assuming that there is no slip between the material and the width direction of the material, the material width direction of the distance (between points P and Q in FIG. 9) where the displacement correcting roll 77 ′ is in contact with the material. the components _{y 2.} By setting the position of c ₁ ″ to be approximately the corresponding bending point of the next roll, the material can smoothly enter the next roll. The material has variations (material, plate thickness, etc.) The degree of bending of the molding material changes depending on the variation of the material, but the inclination angle β can be finely adjusted to cope with it.
Note that the movement amount y ₂ is a movement amount associated with the rotation of the displacement correcting roll 77 ′ inclined with respect to the material traveling direction, so that the movement of the bending point by pushing up the vicinity of the second bending point d is considered. Then, the movement amount becomes even larger.

10 to 12 show a bending point deviation correcting device 41 ″ according to still another embodiment of the present invention. FIG. 10 is a side view showing a part of the bending point deviation correcting device 41 ″ in section, and FIG. It is the front view which notched and showed a part. FIG. 12 shows a part of an upper structure rotating mechanism 100 to be described later in the bending point deviation correcting device 41 ″. FIG. 12A is a cross-sectional view taken along the line AA in FIG. 11, and FIG. It is.
This bending point deviation correcting device 41 ″ is similar to the bending point deviation correcting device 41 of FIGS. 2 to 5 provided with a height adjusting function, a lateral movement adjusting function, and an inclination adjusting function with respect to the deviation correcting roll 77, as shown in FIG. 9, an angle adjustment function (function to adjust the inclination angle β) with respect to the material traveling direction of the deviation correction roll, such as the bending point deviation correction device 41 ′ in FIG. 9, is added.

A specific configuration will be described. The upper flange portion 94a of the drum-shaped member 94 is fixed to the bottom surface of the first frame body 54 "with a bolt, and the lower flange portion 94b is slid into a recess 95a provided in the base 95. A worm shaft in which a worm wheel (but not a whole circumference) 96 is integrally provided on the outer periphery of the drum portion 94c of the drum-like member 94 and a worm 97 that meshes with the worm wheel 96 is attached. 98 is rotatably supported by a bearing 99 provided on a pedestal 95.
A guide tube 53 and a female threaded portion 57 are fixed to the lower surface of the pedestal 95, and the lower portion of the pedestal 95, that is, the height adjusting mechanism 63 is connected to the bending point deviation correcting device 41 of FIGS. It is the same. Also, the internal structure of the first frame 54 ″, that is, the various structures such as the second frame 66, the lateral movement adjustment mechanism 72, the third frame 75, the deviation correcting roll 77, the inclination adjustment mechanism 84, etc. -It is the same as that of the bending point deviation correction apparatus 41 of Fig. 5. In addition, the same code | symbol is attached | subjected to the part which is common in the bending point deviation correction apparatus 41 of FIGS.

In the above-described bending point deviation correcting device 41 ″, height adjustment, lateral movement adjustment, and inclination adjustment of the deviation correcting roll 77 are possible in the same manner as the bending point deviation correcting device 41 in FIGS. Similar to the bending point deviation correcting device 41 ′ of FIGS. 8 and 9, the inclination angle β of the deviation correcting roll 77 with respect to the material traveling direction can be adjusted.
Therefore, this bending point deviation correcting device 41 ″ is preferably applied when correcting the bending point deviation caused by the springback of the molding material and the bending point deviation caused by the bending of the molding material at the same time.

13 to 16 show another embodiment of the roll forming apparatus 1 to which the bending point deviation correcting apparatus 41 (41 ′, 41 ″) is applied. FIG. 13 is a plan view of the roll forming apparatus 1 and FIG. 15 is an enlarged front view showing the configuration of one molding stand 4. Fig. 16 is an enlarged side view of Fig. 16. On the molding machine bed 3 of the roll molding apparatus 1, there are 18 molding stands in the illustrated example. 4 (4A, 4B) are installed at intervals, and the corrector 5 is installed next to the last stand.
As shown in FIGS. 15 and 16 in an enlarged manner, each forming stand 4 has a drive-side stand frame 10 and a work-side stand frame on both sides of upper and lower roll shafts 8 and 9 incorporating upper and lower forming rolls 6 and 7, respectively. 11 and is supported rotatably. The drive side is indicated by DS and the work side is indicated by WS. The forming rolls 6 and 7 are mounted on roll shafts 8 and 9 together with cylindrical spacers 12 and 13 adjusted to a predetermined width dimension on both sides thereof, and the roll center M is set at a predetermined position. Set to. The roll shafts 8 and 9 are directly supported rotatably by chockes (bearing boxes) 14 and 15 attached to the stand frames 10 and 11. The vertical pass line PLz can be adjusted by inserting a stand liner having an appropriate thickness on the lower surface of the lower chock 15.

The drive ends of the roll shafts 8 and 9 are connected to the output shaft 18 a of the speed reducer 18 via the universal joint 16. Reference numeral 19 denotes a drive motor.
The universal joint 16 connects two rotating shafts having different axial directions so that each of the rotating shafts can rotate and allows a change in the distance between the connecting points. For example, the end portions of the telescopic shaft 16a are connected to each other. The structure etc. which are connected to the roll shafts 8 and 9 or the reduction gear output shaft 18a through the universal joints 16b and 16c can be adopted.

In the normal roll forming machine 42 partially shown in FIG. 1, each forming stand is directly installed on the forming machine bed 3. This roll forming apparatus 1 is in the material traveling direction (right side in FIGS. 13 and 14). A plurality of (six in the illustrated example) molding stands 4B on the downstream side are collectively installed on the sole plate 21, and the sole plate 21 is downstream on the molding machine bed 3 with the upstream side serving as a fulcrum (pivot 23). The side is provided so as to be rotatable left and right in the roll width direction. The straightening machine 5 on the downstream side of the final stand is also installed on the sole plate 21. The upstream molding stand 4A excluding the six-stage molding stand 4B may be installed directly on the molding machine bed 3 in the same manner as the molding stand of a normal roll molding machine. In order to align the height with the molding stand 4B, a base plate 22 having the same thickness as the sole plate 21 is fixed on the molding machine bed 3 and installed thereon.
A sole plate rotation drive mechanism 25 that rotates the sole plate 21 around a pivot (fulcrum) 23, and a sole plate fixing mechanism 26 that fixes the sole plate 21 after rotating the sole plate 21 by a predetermined angle are provided (detailed structure thereof). Is omitted). In FIG. 14, the illustration of the sole plate rotation drive mechanism 25 and the sole plate fixing mechanism 26 is omitted.

For example, when the product having the cross-sectional shape of FIG. 17 is formed by the roll forming apparatus 1 described above, the cross-sectional shape of this product has three bending points (b, c, d) of V bending on one side from the other side. An asymmetric composite cross section with many curved bends (e) and a cross section with significant asymmetry with respect to the bending point. Therefore, if the horizontal pass line is not changed over the entire molding stand and is formed straight, it is A large bend occurs on the point side (the side with the asymmetrical bending points b, c, d, e (left side in FIG. 17)).
Therefore, the sole plate 21 is rotated by an appropriate angle about the pivot 23 to the opposite side of the multi-bending point side (that is, the direction in which the molding material bends). This rotation is performed by the sole plate rotation drive mechanism 25. The rotation angle is set to an optimum angle while observing the status of the product that comes out.
By rotating the sole plate 21 to the opposite side to the multi-bending point side, the direction of the horizontal pass line of the multi-stage molding stand 4B on the sole plate 21 is opposite to the multi-bending point side, that is, the direction of the bending. Direction. FIG. 13 shows a horizontal pass line when the sole plate 21 is not rotating as PLy ₀ , and a horizontal pass line when the sole plate 21 is rotated as PLy ₁ .

  Although detailed explanation about the behavior of the molding material at this time is omitted, the molding material has come out of the roll due to the compression strain (strain history) that has been generated by molding until reaching a certain molding stand n. Since the direction (upper side in FIG. 13) that is pulled out by the next roll after exiting the roll is the reverse direction with respect to the direction to be advanced (that is, the direction of bending (lower side in FIG. 13)), the molding Between the stand n and the next molding stand n + 1, a tensile force acts on the side where the bending occurs and the compression strain (distortion history) is reduced, thereby preventing a smooth bending.

The roll forming apparatus 1 can effectively prevent the bending of the forming material when forming a forming material having a cross-sectional shape having a remarkable asymmetry with respect to the bending point. Since the direction is directed to the side opposite to the direction in which the bending occurs, the deviation of the bending point becomes significant.
As described above, in the cross-sectional shape such as the molding material 20 of FIG. 17, the bending point due to the bending of the molding material due to the deviation of the bending point due to the springback of the curved bending portion e and the remarkable asymmetry of the bending point. However, in this roll forming apparatus 1, the bending point is further shifted due to the change in the direction of the horizontal pass line, and thus the bending point is further shifted. Therefore, the bending point deviation correcting device 41, 41 ′, 41 ″ of the present invention is installed between appropriate forming stands and corrected so that the bending point comes to an appropriate corresponding place before entering the next roll. This is effective for facilitating the entry of the molding material into the next roll.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a part of a roll forming apparatus provided with a bending point deviation correcting apparatus according to an embodiment of the present invention, in which (A) is a plan view and (B) is a side view. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view showing a part of a bending point deviation correcting device according to an embodiment of the present invention, partly in cross section. It is the front view which notched and showed a part of said bending point deviation correction apparatus. It is a schematic plan view of the bending point deviation correcting device. FIGS. 2A and 2B show an inclination adjustment mechanism of a deviation correction roll in the bending point deviation correction device, where FIG. 1A shows a state where the deviation correction roll has no inclination, and FIG. 2B shows a state where the deviation correction roll is inclined. It is a figure explaining the effect | action at the time of correcting the shift | offset | difference of the bending point of a molding material mainly resulting from the springback of a molding material with the said bending point deviation correction apparatus (although a deviation correction roll is on the lower side of material, for convenience (Shown in solid line). (A) to (D) are all diagrams showing a modification of the cross-sectional shape of the molding material targeted by the bending point deviation correcting device. 1 shows a bending point deviation correcting device for correcting a deviation of a bending point of a molding material mainly caused by bending of the molding material, wherein (a) is a schematic plan view, and (b) is a front sectional view of a main part. It is a figure explaining the effect | action at the time of correcting the shift | offset | difference of the bending point of the molding material mainly resulting from the bending of a molding material with the bending point deviation correction apparatus of FIG. (Shown as a solid line for convenience). An example of a bending point deviation correction device that is suitable for application when a bending point deviation of a molding material due to both springback and bending of the molding material occurs. It is the side view shown with the cross section. It is the front view which notched and showed the bending point deviation correction apparatus of FIG. FIG. 11 shows a portion of the upper structure rotating mechanism in the bending point deviation correcting device 41 of FIG. 10, (A) is a cross-sectional view taken along the line AA of FIG. 11, and (B) is an enlarged view of a main part of FIG. It shows another example of a roll forming apparatus to which the bending point deviation correcting apparatus is applied, and is a plan view of the roll forming apparatus. It is a side view of the roll forming apparatus of FIG. It is an enlarged front view which shows the structure of one shaping | molding stand in the roll shaping | molding apparatus of FIG. It is an enlarged side view which shows the structure of one shaping | molding stand in the roll shaping | molding apparatus of FIG. It is a figure explaining the cross-sectional shape of the molding material made into the Example in this invention, and the aspect of bending point shift | offset | difference. It is the figure which showed the bending point shift | offset | difference mainly resulting from a spring back of a molding material, and the hole shape of the following roll. It is the figure which showed collectively the bending point shift | offset | difference resulting mainly from the bending of a molding material, and the hole shape of the following roll. It is the figure which showed together the bending point in case the shift | offset | difference of the bending point resulting from the springback of a shaping | molding material, and the deviation | shift of the bending point resulting from a bending are combined, and the hole type of the following roll. FIG. 1 is a sectional view of a conventional misalignment correcting device, in which (a) is a pinch roll system, (b) is a guide shoe system, and (c) is a longitudinal roll system misalignment correcting apparatus.

Explanation of symbols

1, 42 Roll forming device 3 Molding machine bed 4 Molding stand 4A Fixed molding stand 4B Movable molding stand (molding stand on sole plate)
6, 7 Forming roll 20 Forming material 21 Sole plate 23 Support point (pivot)
25 Sole plate rotation drive mechanism 26 Sole plate fixing mechanism 41, 41 ', 41 "Bending point deviation correcting device 51 Base 52 Guide post 53 Guide cylinder 54, 54" First frame body 54a Guide groove 56 Screw 57 Female thread 58 Warm wheel 59 Worm 61 Bearing 62 Worm shaft 63 Height adjustment mechanism 66 Second frame body 67 Guide protrusion 68 Screw 69 Bearing 70 Female thread portion 72 Width direction movement adjustment mechanism 75, 75 'Third frame body 76 Shafts 77, 77' Deviation correction Roll 77a, 77a 'shaft center 79 worm wheel 80 worm 81 worm shaft 82 bearing 83 key 84 tilt adjusting mechanism 90 worm wheel 91 shaft 92 worm 93 worm shaft 94 drum-like members 94a, 94b flange 94c trunk 95 pedestal 95a recess 96 Worm wheel 97 Worm 98 Worm shaft 99 Bearing 100 Superstructure rotation drive mechanism α Inclination angle β (of misalignment correction roll 77) Inclination angle of misalignment correction roll 77 ′

Claims (6)

The first bending point in the vicinity of the end in the material width direction and the first bending point by using a roll forming apparatus that obtains a molded product having a predetermined cross-sectional shape by bending a belt-shaped metal plate between upper and lower rolls of a multi-stage forming stand. When forming a molding material having a cross-sectional shape having a second bending point on the center side, the entry position to the molding roll of the molding stand next to the first bending point in the vicinity of the material width direction end is the next A bending point deviation correction device that corrects deviation of the bending point when it is displaced from the corresponding bending point of the molding roll of the molding stand,
In the middle of the front and rear forming stands, an idle deviation correcting roll that can rotate while contacting the lower surface of the material is provided so that the position in the material width direction and the height position can be adjusted. A bending point deviation correcting device in a roll forming apparatus, characterized in that it is provided in such a manner as to push up a position near the second bending point between the bending point and the second bending point.   2. A bending point in a roll forming apparatus according to claim 1, wherein the axis of the deviation correcting roll is in a vertical plane perpendicular to the material traveling direction and the vertical inclination of the axis is adjustable. Deviation correction device.   2. The roll according to claim 1, wherein the axis of the deviation correcting roll is in a vertical plane having an angle with respect to a direction orthogonal to the material traveling direction, and the angle of the axis is adjustable. Bending point misalignment correction apparatus in a molding apparatus.   4. A bending point deviation correcting device in a roll forming apparatus according to claim 3, wherein the vertical inclination of the axis of the deviation correcting roll is also adjustable.   When forming a molding material having a cross-sectional shape between the first bending point and the second bending point, the second correction point on the concave surface of the curved bending portion. The bending point deviation correction apparatus in the roll forming apparatus according to claim 1, wherein the bending point deviation correction apparatus is provided in a manner of pushing up the offset position.   In the roll forming apparatus, a plurality of downstream forming stands are collectively installed on the sole plate, and the sole plate is provided such that the downstream side can be rotated in the roll width direction right and left with the upstream side in the material traveling direction as a fulcrum. 6. The bending point deviation correcting device in a roll forming apparatus according to claim 1, wherein the bending point deviation correcting device is installed between forming stands on a sole plate.

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